Watch the Missing Mutes online guitar lesson by Brad Carlton from Chord Studies: CAGED Chords Vol. 2
This is a vi - ii - iii progression in the key of C. For the Am chord, you'll utilize the Cm form out of the EDCAG system at the ninth position. When you go to the Dm, you'll be using the Em form with a six string barre. Our last chord, the Em, uses the EDCAG Gm form. Watch out on the Am chord that you don't unintentionally mute any strings!